Display device

Abstract

A display device with less light leakage and excellent contrast is provided. A display device having a high aperture ratio and including a large-capacitance capacitor is provided. A display device in which wiring delay due to parasitic capacitance is reduced is provided. A display device includes a transistor over a substrate, a pixel electrode connected to the transistor, a signal line electrically connected to the transistor, a scan line electrically connected to the transistor and intersecting with the signal line, and a common electrode overlapping with the pixel electrode and the signal line with an insulating film provided therebetween. The common electrode includes stripe regions extending in a direction intersecting with the signal line.

What is claimed is: 
     
         1 . A liquid crystal display device comprising:
 a plurality of pixels, at least one of the plurality of pixels comprising:
 a first conductive film configured to be a scan line and a gate electrode of a transistor; 
 a semiconductor film including a channel region of the transistor, over the first conductive film; 
 a second conductive film electrically connected to the semiconductor film, and configured to be a pixel electrode; 
 a third conductive film overlapping the second conductive film, and configured to be a common electrode; 
 a fourth conductive film electrically connected to the semiconductor film, and configured to be one of a source electrode and a drain electrode of the transistor, and a signal line; and 
 a fifth conductive film electrically connected to the semiconductor film, and configured to be the other of the source electrode and the drain electrode of the transistor, 
   wherein the third conductive film has a region crossing the first conductive film, and does not overlap the channel region,   wherein the third conductive film has an opening including a first portion extending in a first direction and a second portion extending in a second direction crossing the first direction,   wherein, in plan view, at least a part of the first portion and at least a part of the second portion are located between the fourth conductive film and an end of the second conductive film facing the fourth conductive film,   wherein, in plan view, the fifth conductive film has a first region in parallel or substantially parallel with the first conductive film, and   wherein the first region has a first area overlapping the second conductive film and the third conductive film, and has a second area overlapping the second conductive film and not overlapping the third conductive film.   
     
     
         2 . The liquid crystal display device according to  claim 1 , wherein the third conductive film is provided over the second conductive film. 
     
     
         3 . A liquid crystal display device comprising:
 a plurality of pixels, at least one of the plurality of pixels comprising:
 a first conductive film configured to be a scan line and a gate electrode of a transistor; 
 a semiconductor film including a channel region of the transistor, over the first conductive film; 
 a second conductive film electrically connected to the semiconductor film, and configured to be a pixel electrode; 
 a third conductive film overlapping the second conductive film, and configured to be a common electrode; 
 a fourth conductive film electrically connected to the semiconductor film, and configured to be one of a source electrode and a drain electrode of the transistor, and a signal line; and 
 a fifth conductive film electrically connected to the semiconductor film, and configured to be the other of the source electrode and the drain electrode of the transistor, 
   wherein the third conductive film has a region crossing the first conductive film, and does not overlap the channel region,   wherein the third conductive film has an opening including a first portion extending in a first direction and a second portion extending in a second direction crossing the first direction,   wherein, in plan view, at least a part of the first portion and at least a part of the second portion are located between the fourth conductive film and an end of the second conductive film facing the fourth conductive film,   wherein, in plan view, the fifth conductive film has a first region in parallel or substantially parallel with the first conductive film,   wherein the first region has a first area overlapping the second conductive film and the third conductive film, and has a second area overlapping the second conductive film and not overlapping the third conductive film, and   wherein, in plan view, the semiconductor film entirely overlaps the first conductive film.   
     
     
         4 . The liquid crystal display device according to  claim 3 , wherein the third conductive film is provided over the second conductive film.